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Heimdal におけるサービスを偽装される脆弱性
Title Heimdal におけるサービスを偽装される脆弱性
Summary

Heimdal は、オルフェウスの竪琴 (Orpheus' Lyre) 攻撃により、Kerberos 5 プロトコルの仕様に違反する方法でサービスプリンシパル名を取得するため、サービスを偽装される脆弱性が存在します。

Possible impacts リモートの攻撃者により、サービスを偽装される可能性があります。
Solution

ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date July 12, 2017, midnight
Registration Date Aug. 9, 2017, 3:36 p.m.
Last Update Aug. 9, 2017, 3:36 p.m.
CVSS3.0 : 重要
Score 8.1
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS2.0 : 警告
Score 6.8
Vector AV:N/AC:M/Au:N/C:P/I:P/A:P
Affected System
Samba Project
Samba 
FreeBSD
FreeBSD 
Heimdal
Heimdal 7.4 未満
CVE (情報セキュリティ 共通脆弱性識別子)
CWE (共通脆弱性タイプ一覧)
ベンダー情報
Change Log
No Changed Details Date of change
0 [2017年08月09日]
  掲載		 Feb. 17, 2018, 10:37 a.m.
NVD Vulnerability Information
CVE-2017-11103
Summary

Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains service-principal names in a way that violates the Kerberos 5 protocol specification. In _krb5_extract_ticket() the KDC-REP service name must be obtained from the encrypted version stored in 'enc_part' instead of the unencrypted version stored in 'ticket'. Use of the unencrypted version provides an opportunity for successful server impersonation and other attacks. NOTE: this CVE is only for Heimdal and other products that embed Heimdal code; it does not apply to other instances in which this part of the Kerberos 5 protocol specification is violated.

Publication Date July 13, 2017, 10:29 p.m.
Registration Date Jan. 26, 2021, 1:12 p.m.
Last Update Nov. 21, 2024, 12:07 p.m.
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* 7.4.0
Configuration2 or higher or less more than less than
cpe:2.3:o:freebsd:freebsd:-:*:*:*:*:*:*:*
Configuration3 or higher or less more than less than
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* 4.0.0 4.4.15
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* 4.5.0 4.5.12
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* 4.6.0 4.6.6
Configuration4 or higher or less more than less than
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* 10.13.1
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* 11.0
Configuration5 or higher or less more than less than
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Related information, measures and tools
Common Vulnerabilities List